Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17330#discussion_r110885627
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala ---
@@ -670,4 +677,139 @@ class CachedTableSuite extends QueryTest with
SQLTestUtils with SharedSQLContext
assert(spark.read.parquet(path).filter($"id" > 4).count() == 15)
}
}
+
+ test("SPARK-19993 simple subquery caching") {
+ withTempView("t1", "t2") {
+ Seq(1).toDF("c1").createOrReplaceTempView("t1")
+ Seq(1).toDF("c1").createOrReplaceTempView("t2")
+
+ sql(
+ """
+ |SELECT * FROM t1
+ |WHERE
+ |NOT EXISTS (SELECT * FROM t1)
+ """.stripMargin).cache()
+
+ val cachedDs =
+ sql(
+ """
+ |SELECT * FROM t1
+ |WHERE
+ |NOT EXISTS (SELECT * FROM t1)
+ """.stripMargin)
+ assert(getNumInMemoryRelations(cachedDs) == 1)
+
+ // Additional predicate in the subquery plan should cause a cache
miss
+ val cachedMissDs =
+ sql(
+ """
+ |SELECT * FROM t1
+ |WHERE
+ |NOT EXISTS (SELECT * FROM t1 where c1 = 0)
+ """.stripMargin)
+ assert(getNumInMemoryRelations(cachedMissDs) == 0)
+ }
+ }
+
+ test("SPARK-19993 subquery caching with correlated predicates") {
+ withTempView("t1", "t2") {
+ Seq(1).toDF("c1").createOrReplaceTempView("t1")
+ Seq(1).toDF("c1").createOrReplaceTempView("t2")
+
+ // Simple correlated predicate in subquery
+ sql(
+ """
+ |SELECT * FROM t1
+ |WHERE
+ |t1.c1 in (SELECT t2.c1 FROM t2 where t1.c1 = t2.c1)
+ """.stripMargin).cache()
+
+ val cachedDs =
+ sql(
+ """
+ |SELECT * FROM t1
+ |WHERE
+ |t1.c1 in (SELECT t2.c1 FROM t2 where t1.c1 = t2.c1)
+ """.stripMargin)
+ assert(getNumInMemoryRelations(cachedDs) == 1)
+ }
+ }
+
+ test("SPARK-19993 subquery with cached underlying relation") {
+ withTempView("t1", "t2") {
+ Seq(1).toDF("c1").createOrReplaceTempView("t1")
+ Seq(1).toDF("c1").createOrReplaceTempView("t2")
--- End diff --
where is `t2` used?
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